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Mineral Resources > Online Spatial Data > Geology > by state > North Carolina Geology

Geologic units in Rowan county, North Carolina

Cid Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 3 % of this area

(southwest of Asheboro); Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Lithology: felsic metavolcanic rock; mafic metavolcanic rock; intermediate metavolcanic rock; meta-argillite; metasedimentary rock

Meta-ultramafic Rock (Paleozoic/Late Proterozoic) at surface, covers < 0.1 % of this area

Meta-ultramafic Rock - metamorphosed dunite and peridotite; serpentine, soapstone, and other altered ultramafic rock. Only larger bodies shown.

Lithology: metamorphic rock; serpentinite

Gabbro of Concord Plutonic Suite (Devonian/Ordovician) at surface, covers 2 % of this area

Gabbro of Concord Plutonic Suite (399-479 my) - Barber, Concord, Farmington, Mecklenburg, and Weddington intrusives.

Lithology: gabbro

Granite of Salisbury Plutonic Suite (Devonian/Silurian) at surface, covers 11 % of this area

Granite of Salisbury Plutonic Suite (385-415 my) - pink, massive to weakly foliated. Gold Hill, Kannapolis, Salisbury, Southmont, and Yadkin intrusives.

Lithology: granite

Floyd Church Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

(Southwest of Asheboro); Metamudstone and Meta-Argillite - thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Lithology: meta-argillite; meta-conglomerate; metasedimentary rock; metavolcanic rock

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 18 % of this area

Metamorphosed Quartz Diorite - foliated to massive.

Lithology: metamorphic rock

Metamorphosed Mafic Rock (Paleozoic/Late Proterozoic) at surface, covers 11 % of this area

Metamorphosed Mafic Rock - metagabbro, metadiorite, and mafic plutonic-volcanic complexes.

Lithology: metamorphic rock

Cid Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 5 % of this area

(Southwest of Asheboro); Metamudstone and Meta-Argillite - thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Lithology: meta-argillite; meta-conglomerate; metasedimentary rock; metavolcanic rock

Fine-grained Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area

Fine-grained Biotite Gneiss - strongly foliated; minor layers of amphibolite and muscovite schist.

Lithology: biotite gneiss; amphibolite; mica schist

Phyllite and Schist (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

Phyllite and Schist - minor biotite and pyrite; includes phyllonite, sheared fine-grained metasediment and metavolcanic rock.

Lithology: phyllite; schist; phyllonite; metasedimentary rock; metavolcanic rock

Granitic Rock (Permian/Pennsylvanian) at surface, covers 19 % of this area

Granitic Rock (265-325 my) - megacrystic to equigranular. Castalia, Lillington, Medoc Mountain, Sims, Contentnea Creek (?), and Elm City (?) intrusives.

Lithology: granite

Metamorphosed Gabbro and Diorite (Paleozoic/Late Proterozoic) at surface, covers 0.3 % of this area

Metamorphosed Gabbro and Diorite - foliated to massive.

Lithology: metamorphic rock

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Metamorphosed Granitic Rock (520-650 my) - megacrystic, well foliated, locally contains hornblende; Fountain intrusive.

Lithology: metamorphic rock

Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 27 % of this area

Metavolcanic Rock - interbedded felsic to mafic tuffs and flowrock.

Lithology: felsic metavolcanic rock; mafic metavolcanic rock

Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Lithology: felsic metavolcanic rock; mafic metavolcanic rock; intermediate metavolcanic rock; meta-argillite; metasedimentary rock

Quartzite and Quartz-Muscovite Schist (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Quartzite and Quartz-Muscovite Schist - garnet, andalusite, kyanite, or sillimanite occur locally.

Lithology: quartzite; mica schist